Regen is no more than a gimmick, the amount of power you could generate over 40 miles might just take you another 100m - downhill.
However, it's a harmless gimmick, so if you still want it a KTM Panasonic hub bike is as good as any.
Regen does rule out Bosch powered crank drives which is a pity.
Lots of choice of maker and style, and the 11ah battery would do 40 miles, assuming they weren't too hilly and you were prepared to put some effort in.
Another option is Kalkhoff.
The importer 50 Cycles has some offers at the moment.
A lot of their bikes have big - 15ah or 17ah - batteries, which is never a bad thing.
There's a post on here, or the obvious link:
http://www.50cycles.com/